I use Magic Sizing in the green can for extra crispness especially when I am fussy cutting where the grain won't be right
For much lighter, I use Dryel Spray. it is a pump which I like.
If you buy a product at a quilt shop you can be guaranteed it will be much higher than if you find the equivalent in a grocery store.
Years ago everyone used Orvus for washing their fabrics. In the quilt shop it was $6 for a tiny bottle. At Farm and Fleet, it was $8 for a gallon.
I would tell you to save your money and buy fabric with it.